Time Travel Simulation Brief and here is the information I mentioned, which Eric and Jordan Liban explained to their blocks.
Both the general and special relativity theories have been proven with GPS satellite technology that has very accurate timepieces on board. The effects of gravity, as well as the satellites' increased speed above the Earth relative to observers on the ground, makethe unadjusted clocks gain 38 microseconds a day. (Engineers make calibrations to account for the difference.)
In a sense, this effect, called time dilation, means astronauts are time travelers, as they return to Earth very, very slightly younger than their identical twins that remain on the planet.
The original experiment write-up This one is too technical until you get farther along in understanding the science and math, but I included it to show you it really does exist.
More about being in two places at once
Brian Cox (Physicist at Hadron Collider, CERN, Switzerland)
More about the 12 Particles and 4 Forces: